main.order_by_optimizer_innodb fails in buildbot

main.order_by_optimizer_innodb 'xtradb'  w1 [ fail ]

        Test ended at 2016-07-03 04:07:35

CURRENT_TEST: main.order_by_optimizer_innodb

--- /usr/share/mysql/mysql-test/r/order_by_optimizer_innodb.result	2016-07-03 02:45:44.000000000 -0400

+++ /dev/shm/var/1/log/order_by_optimizer_innodb.reject	2016-07-03 04:07:35.159355291 -0400

@@ -40,7 +40,7 @@

 # The following should use range(ux_pk1_fd5), two key parts (key_len=5+8=13)

 EXPLAIN SELECT * FROM t2 USE INDEX(ux_pk1_fd5) WHERE pk1=9 AND fd5 < 500 ORDER BY fd5 DESC LIMIT 10;

 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

-1	SIMPLE	t2	range	ux_pk1_fd5	ux_pk1_fd5	13	NULL	137	Using where

+1	SIMPLE	t2	ref	ux_pk1_fd5	ux_pk1_fd5	4	const	137	Using where

 # This also must use range, not ref. key_len must be 13

 EXPLAIN SELECT * FROM t2                       WHERE pk1=9 AND fd5 < 500 ORDER BY fd5 DESC LIMIT 10;

 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysqltest: Result length mismatch